The left most button on the display is labeled TEST. Push that to display the level of the holding tank and the fresh water supply. If you are not drawing any power off of the batteries and are not plugged into shore power you can also get an idiot light display of the battery state. Most of us use either a volt meter or a battery monitor to keep an eye on the battery.
fwiw, I find that we use about 5 gallons of water per person per day, including a navy shower every other day and a sponge bath in between. This is with 5 adults camping for a long weekend.
If you over fill the gray water tank, it will backup into the shower. This will not cause a problem unless you use the shower tub as a hamper, which explains why I know this.
Some owners have had a problem with water leaking out of the top of the TM gray water tank on to the ground when it is overfull. This seems to be caused by the top pipe fitting not being properly attached. This only causes a problem when over filling the gray tank.
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